Machine for sawing piston rings



Aug 9, 1932- J. H. HQERN Lamme MACHINE FOR SAWING PISTON RIQNGS ATTORNEY @a 3*33 J. H. HQERN 1,870,996

MACHINE FOR SAWING `PIS'ION RINGS Filed Aug. 3l. 1929 5 Sheets-Sheet 2 INVENTOR Joseph J-l. J-foern.

ATTORNEY Aug. 9, 1932. l J, H, HOERA v 1,870,996

MACHINE FOR SAWING PSTON RINGS INVENTOR y Joeyh J-K Jfoern.

7W MZ 92....

ATTORNEY JOSEPH E. HOERN, F

remates Aug. 9,1932 1,870,996

UNITED siA'ras iinilaila'rv Trou. A conroaarion or :Ironman mcimm ron aawnve- Hamon mcs application mea August a1, ma serial no. ss9,esi.`

This invention relates to new and useful work to the cutter. Each of the ring chucks improvements in machines for sawing pisin the turret is provided withan automatiton rings. It is sometimes necessary 1n the cally operatin locating tongue by means of manufacture of piston rin to re-saw the which the en s of the rings are accuratflallly 5 clearance gap in the ring a er the finishing located in position to be re-cut by the m is re-cut, and which is also adapted to e]ect operation in order to insure a proper and. ing cutter, an automatic clamp adapted to uniform clearance between the ends of the hold the rin in position, and automatically linished rings, and my machine is particularoperating electing means for ejecting the 1y adapted to perform this operation. rings from the turret after they have been One object of my invention is to provide operated upon. y y amachine for're-sawing the clearance gap 1n Specifically the machine comprises a repiston packing rings which will operat'econ volvng turret 10 which is mounted upon ,tinuously and automatically andA require atthe slidable base l11. The base 11 also cartendance only for loading. ries a power transmission and inde Another object of my invention is to promechanism designated generally by the nuvide novel means for accurately locating the meral 12. A stationary bearing,13 is ro- -ends of the ring in the. machine in position vided in which the end of the power aft `to be re-sawed. is slidably and rotatably journaled. A ixf Another object of my invention is to proture 14 is provided upon which the vide a machine adapted to car a plurality cutter 15 is mounted and which maybe drivof rings during operation an adapted to en by any conventional means such as a. belt present them in succession to the milling and pulley. cutter by means of which the clearance ap The, turret 10 is positioned in an inclined the rings after they have been. operated upon inclined axis in order to present the diagoby the milling cutter.

' y nally cut ends of the ring to the millin cut- SAGINAW, MICHIGAN, .ASSIGNOR T0 WILGOX-RICH COBPOB.-

lane as shown in Fig. 2 and rotates about an With these and other objectsin view, my ter which is in verticalposition. As s own invention consists in the arrangement, comin Fig. 3,'it comprises a power transmission bination and construction of the various parts casing 20 `in wfichis journaled ashaft 21, of my improved device, as described 1n the having its lower end suitably held inbearings specification, claimed Ain. 'my claims, and 22 in the' bottom of the casing and havingits shown in the accompanying drawings, in intermediate portion'held in bearin whic p.

Fig. 1 is a side elevation of my machine gs 23 in within the casing 2Ov is a beveled gear 24 partly in section to better illustrate the 'conwhich engages a beveled gear 25 keyed to the struction thereof. lend of the indexing shaft 26, which is suit- Fig. 2 is an enlarged end elevation of my ably journaled in the side of the casing 20. machine taken from the left yin Fig. 1. Secured to the upper end of the shaft 21 is the Fig. 3 is a sectional view taken on the line"turretl0, which comprises a circular member 3--3 of Fig. 2.

Fig. 4 is a view taken von line 4 4 of Fig. 3. tatable therewith. As shown in Fi 1, the

Fig. 5 is a view taken on line 5-5 of Fig. 4. upper face of the turret 10 is provi ed 'with In general my machine comprises an infour identical ring positions or chucks 3l termittently rotating turret' in which a pluwhich are radially disposed about the center 'rality of ring chucks arearranged, a rotary of the turret. Each of these ring positions milling cutter or saw for cutting the gaps in comprises a countersunk generally circular the rings, and mechanism for `intermittently s ace in the face of the turret. As shown in rotating the turret to bring the chucks sucig. 3, a circular opening 35 is formed in each cessively into alignment with the milling ring position adjacent its outer edge and a cutter, and for reciprocating it to feed the depending sleeve 36 is lformed about the un- 30 centrally disposed onjthe shaft 21 and rothe top of the casing. Keyed to the shaftv 21 i -der edges of said opening. Slidably positioned in this opening 35 and in the sleeve 36 is a clamping member 37 whch is cylindrical in form and is provided with a laterally extendin bifurcated arm portion 38 at its upper en The upper portion of the clamping member 37 is slotted out as indicated at 39, Figs. 1` and'4, and the lower end of the member 37 is also bifurcated as shown in Fig. 3. Between the bifurcations in the lower end is positioned a roller 40 supported upon a crosspin 4l. A coil spring 42 is positioned around the sleeve 36 and bears at one end against the underside of the turret 10 and at the otherl end against a washer 41a, Awhich is supported by the cross-pin 41. The spring 42 is nori mally tensioned to force the clamping member 37 downwardly. Secured to the top of the transmission casing 26 beneath the unloading and loading stations of the turret is a cam plate 43, with which the roller is adapted to contact and raise the clamping member 37 against the compression of the spring 42.

Around the border of each ring position is "a ring-like bushin 32, whose inside circumference correspon s substantially to the outside diameter of the finished piston ring when disposed upon the piston and in the cylinder in which it is to be used. The rings 32 are flattened at those edges which approach the edlge of the turret member 10 and are provi ed with diagonal slots 33 through which the milling cutter 15 passes to engage the Ypiston ring, and the edges of the turret 10 at these points are beveled out as shown at 34 in Fig. 3 to provide clearance for the millina cutter. Also secured in the ring positions 31 and beneath the rings 32 are plates 32a provided with openings through whichthe clamping members 37 extend, and also provided with slot extending inwardly from the clampin member 37. This slot 45 is the shape o an inverted T in cross section as shown in Fi 5, and in it is positioned an elongated T-s aped block 46 which'has a thin tongue-like member 47 diagonally positioned and secured at its forward end, which slides in the dia onal slot 48 (Fig. 1) in the plate A32a exten ing outwardly from the openlng cent the top of the transmission casing 20.

Secured to the end of the shaft 51 is a' cam lmember 53, and positioned around the shaft 51 between the cam member 53 and the under surface of the turret 10 is a coil spring 54 which is secured at one end to the cam 53 and at the other to a fixed anchor on the under side of the turret 10. The free end of the crank member 51, as shown in Fig. 4, is provided with an elongated slot 55 into which extends a pin 56 secured in the sliding tongue block 46. (Fig. 3.) Secured upon the top of the transmission casing 20 adjacent the shaft 21 is a cam plate 57 against which the end of the cam member 53 will strike and cause the shaft 51 to turn, thereby operating the crank member 50 to slide the tongue bar 46 in wardly in its slot and thereby retract the tongue 47 in the slot 48. The spring 54 which is attached at one end to the cam 53 and at the other to the underside of the turret 10 and will operate to turn the shaft 51 and thereby drive the tongue block 46 outwardly in its slot after the cam member 53 has ceased contact with the cam plate 57.

(Fig. 3.) Also secured to the under side of the turret 10 at each ring position and at each side thereof are depending sleeves 58 in which are secured pins 59 having a head formed on their lower ends and having blades formed on their upper ends which are adapted to project through the slots 60 (Fig. 1) formed in the plates .32a and in the top of the turret 10. A coil spring 61 is positioned around the lower end of each pin 59 and bears at one end against the lower end of the sleeve 58 and at the other end against the headfiange of the pin 59, and is tensioned to force the {in 59 downwardly in the sleeve 58 and there y retract the blade on the upper end of the pin to a position iiush with or beneath the sur face of the plate 32a. Another cam plate (not shown) is positioned on the top of the transmission casing 2O adjacent the unloading sta- -tion so that the heads of pins 59 will engage therewith just before the ring position to which they are attached reaches the unloading station. This will cause the pins 59 to rise in the sleeves 58 against the compression of the' spring 61 and will drive the blades through the slots 60 and thus kick the ring out of the turret.

(Figs. 1 and 3.) Formed in the lower edge of the turret 10 and protruding therefrom beneath each ring position are sockets 63, and (Fig. 3) in these sockets are positioned bushings 64 having downwardly presented tapered openings therein. In the side of the transmission housing 20 and adjacent and above the bearing for the shaft 26 and adjacent the position of the milling cutter is formed a socket 65 in which is set a thimble 66, and in this thimble is slidably positioned a plunger 67. On top of the plunger is formed a tapered head'or pin 68 which is adapted to fit into the tapered opening in the bushing 64. The bottom part of the plunger 67 is hollow and a coil spring 69 is positioned therein, bearing at one end against the thimble 66 and at the other end against the plunger 67, tending to 1.) iournaled in a stationary bearing bracketl for rotation.

68 with the bushing 64. Registering slots are provided in the outer side of thesocket and the thimble 66 and a pin 70 extends therethrough and is secured at one end in the plunger 67 and positioned with the other end extending outwardly through and beyond the slots. This pin co-operates with the upper edge of the slot in the socket 65 and provides a stop for the plunger and secures it in the socket and thimble. The outer end of the pin 70 is engaged by the cam member 71, which is loosely secured upon and rotates about the indexing shaft 26 and which will engage the pin 70 and force the plunger 67 downwardly in the thimble 66 and thus retract the head 68 from the socket in the bushing 64. The plunger 67 serves to lock the turret in a stationary position during the milling operation ,on the ring.

Power is supplied through a shaft (Fig.

or box 101. To the end of the shaft is secured a beveled pinion 102 which meshes with another beveled pinion 103 slidably secured on the end of a shaft 104. The shaft 104 is slidably and rotatably journaled in the bearing box 101 and extends thelefrom at right angles to the direction of the shaft 100.

Secured upon the slidable base 11 as shown in Fig. 1 is a bearing bracket 105, in the lower part of which is journaled the indexing shaft 26 and in the upper part of which lis journaled shaft 104. Secured upon the left end of the shaft 104 is a gear 106 which meshes with a gear 107, which is carried by a sleeve`108 rotatably mounted upon the shaft 26; yTo the end of the sleeve 108 is attached the cam member 71 which co-operates with the pin 70 to operate the plun er 67 and release the turretlO ecured tothe right end of the shaft 26 is the sprocket member 109 of a Geneva wheel, and secured to the intermediate portion of the shaft 104 is the cam and pin member 110 of the Geneva assembly adapted to co-operate with and engage the sprocket member 109. Also secured to the shaft 104 to the right ofthe cam and pin-member 110 is a cam member 111 which is adapted to engage a roller 112 adjustably secured in a fixed bracket 113 and cause the base 11 to slide to the left thereby moving the turret 10 out of engagement with the milling cutter. At-

. tached to the end of the sliding base 11 is a ret, the Geneva mechanism is arranged to cause the turret to make a quarter revolution at each revolution of the shaft 104. The turret is securely locked in a stationaryposition each time one of the ring positions is indexed to thepoint of engagement with the milling cutter 15. This is accomplished by means of the spring plunger 67 engaging the socketed bushing 64. 4This lock is released by the cam member 71, which, driven by the gears 106 and 107 engages and retracts the plunger 67 by means of the pin 70 u on completion of each milling operation. ach

time the milling operation is completed the turret 10 will be moved away from the millingcutter by the action of the cam member 111 in engagement with the roller 112 and indexed by the Geneva mechanism, `and the turret will be pulled into engagement with the milling cutter by means of the spring 114 each time the indexing movement is completed.

` 'lhe rings are loaded in the turret at the position A and are located by positioning the ends of the ring on opposite sides of the tongue 47 and bringing' one end firmly against it. At this point the tongue 47 isf extended into the slot- 33 in the ring 32. The

turret is then indexed to the right to position B and the clamping members 37 are moved downwardly until the arms 38 engage the ends of the iston ring on each side of the gap and firm y clamp them against the plate 32a. The turret is then indexed'to position C, which is the sawing position, and as vit Vapproaches this pcsition the cam member 53 on the shaft 51, which operates the locating tongue 47, engages the cam plate `57 and causes the shaft 51 to rotate. and retract the tongue 47 from the ring gap. When position C is reached thehigh portion of cam mem# ber 111 on the`v`s'haft-.1Q4 runs out of contact with the roller 112 and permits the spring 114 to draw the base 11 and the turret 10 to the right against `the milling cutter 15 `which will enter the slotv 33 in the ringv 32 and-erh. gage and trim the ends of the piston ring which are registered with this slot 33. The turret then moves 'to the unloading position D and the roller 40 on the end of the clamping member 37 `engages the cam plate 43 on the transmission casing `20 and raises the clamping member to free the ring. Also the kick-out pins 59 will engage cam plates on the transmission casing 20 'and be forced upwardly so that their blades will protrude through the slots 60 and force the piston ring out of the holding ring32. The` turret will then index to bring the ring position back to the loading position A The kiclwmt pins during this indexing movement to loading position will run out of contact with their cam members on the transmission casing 20 and will retract so that the les ' low the surface of the plate 32a. The clamping member 37, however, is still held in raised position and does not come out of engagement with its cam plate 43 until the indexing movement to position B, Also as the ring position indexes from the unloading station D to the station A the cam member 53 on the shaft 51 controlling the locating tongue 47 will'run lout of contact with its cam plate V 537 and .-t-he spring 54 will cause the shaft 5l to rotate and drive the locating tongue 47 outwardly into the slot 33 in the holding ring 32.

Formal changes may be made in the specific embodiment of the invention described without departing fromthe spirit and substance of the broad invention, the scope of which is commensurate with the appended claims. l

What I claim is:

rings comprising, 1n comblnatlon, a cutter, a

v aqregister with said cutter slot, spring urged clamps mounted in said turret and positioned to clamp the rings in saidchucks, normally restrained ejecting members mounted in said turret and positioned to engage the under side 35 of the ring in each chuck, means for moving said turret to bring said ring chucks into alignment with said cutter and for producin a relative feeding movement between sai cutter` and turret, means operable by the 40 movement of said turret relative to said base forretracting said tongues in advance of said cutter, and means operable by said moyement for releasing said clamps and actuatin said ejecting members `after the operation o said cutter.

2. Apparatus for recutting gaps in piston rings comprising, in combination, a cutter, a base` member, a turret rotatably mounted thereon, a plurality of ring chucks mounted in said turret each adapted to confine a piston ring to a predetermined circumferential dimension and having a slot therein adapted to admit said cutter, a tongue member in each of said chucks positioned to intervene in the gap .between the ends of a piston ring and to register with said cutter slot, normally restrained ejecting members mounted in said turret and positioned to engage the under side of the ring in each chuck, means for moving 60. said turret to bring said ring chucks successively into alignment with said cutter and for producing a relative feeding movement between said cutter and turret, means operable by the movement of said turret relative 05 to said base for retracting said tongues in ad- 1. Apparatus for recutting gaps in piston' vance of said cutter, and means operable by the movement of said turret relative to said base for actuating said ejecting members to force said rings from said chucks after the operation of said cutter.

3. Apparatus-for recutting gaps in piston rings comprising, in combination, a'cutter, a base member, a turret rotatably mounted on said base member, a plurality of rin chucks mounted in said turret each adapted to confine a piston ring to a predetermined circumferential dimension and having a slot therein adapted to admit said cutter, a tongue member in each of said chucks positioned to intervene in the gapbetween the ends of a. piston ring and to register with said cutter slot, spring urged clamps mounted in said turret and positioned to clamp the rings in said chucks, means for moving said turret to bring said ring chucks successlvely -into alignment with said cutter and for producing a relative feeding movement between said cutter andV turret, means operable b the movement of said turret relative to said base for retracting said tongues in advance of said cutter,

and means operable by the movement of said turret relative to said base for releasing said clamps af er the operation of said cutter.

4. Appa atus for recutting gaps in piston rings comprising in combination a cutter, a. base member, a turret rotatably mounted on said base member, a plurality of ring chucks mounted in said turret each adapted to confine a piston ring to a predetermined circumferential dimension and having a slot therein adapted to admit said cutter, a tongue member in each of said chucks positioned to intervene in the gap between the ends of a piston ring and to register with said cutter slot whereby the ring ends are positioned relative to said cutter slot, means for moving said turret to bring` said chucks successively into alignment with said cutter and for producingl ter, a tongue member in each of said chucks positioned to intervene inthe gap between the ends of a piston ring and to register with said cutter slot, means for moving said turret to bring said ring chucks successively'into alignment with said cutter and for producing a relative feeding movement between said turret and cutter, and means for retracting advance of said cutter.

6. Apparatus for recutting gaps'in piston rings comprising, in combination, a cutter a rotatably mounted turret, a plurality oi ring chucks mounted in said turret each' adapted to confine a piston ring to a predetermined circumferential dimension and havii g a slot therein adapted to admit said cutter, a tongue member in each of said chucks positioned to intervene in the gap between the ends of a piston ring and to register with said cutter slot, means for moving said turret to bring said ring chucks successively into alignment with said cutter and for producing a relative feeding movement between said turret and cutter, and means for retracting said tongues relative to said cutter slots in advance of said cutter and for advancing the same after the operation of said cutter.

7. Apparatus for recutting gaps in piston rings comprising, in combination, a cutter, a rotatable turret, a plurality of rin chucks mounted in said turret each adapte to confine a piston ring to a predetermined circumferential dimension and having a slot therein adapted to admit said cutter, a tongue member in each of said chucks positioned to intervene in the gap between the ends of a piston ring and to register with said cutter slot clamps mounted in said turret and positioned to clamp the rings in said chucks, ejecting members mounted in said turret and positioned to oust the rings from said chucks means for moving said turret to bring said chucks successively into alignment with said cutter and for producing a relative feeding movement between said turret and cutter, means for manipulating said tongues controlled by the movement of said turret, and means' for operating said clamps and said ejecting members controlled by the movement of .said turret. y 4

8. Apparatus for recutting gaps in piston rings comprising, in combination, a cutter, a rotatable turret, a pluralit of rin chucks mounted in said turret eac adapte to confine a piston ring to a redetermined circumferential dimension an having a slot therein ada ted to admit said cutter, a tongue member in each of said chucks positioned to intervene in the gap between the ends of a piston ring and to register with said cutter slot, clamps mounted in said turret and positioned to clamp the rings in said chucks, means for moving said turret to bring said chucks successively into alignment with said cutter and for producing a relative feeding movement between saidturret and cutter, means fonmanipulating said tongues controlled by the movement of said turret, and means for operating said clamps controlled by the movement of said turret.

9. Apparatus for recutting gaps in piston inr adapted to admit said cutter, a ton Se u memberl in each'of said chucks positions te `intervene in the gap between the endsof al pistoni-ing and toregister with said cutter slot, ejecting members mounted in said turret and positioned to oust the rings from said chucks, means for moving `said turret to.

bring said chucks successively into alignment with said cutter and for producing a ,relative feeding movement between said tur. ret and cutter, means for manipulating said` tongues controlled by the movement of said turret, and means for o erating said ejecting members controlled y the movement of saidturret,

.10. Apparatus for recutting gaps in pis-y ton rings comprising, in combination. a cutter, a rotatable turret, a pluralit of rin chucks mounted in said turret eacii adapte to confine a piston ring to a redetermined crcumferential dimension anzij member in each of said chucks osition to *intervene in the gap between e ends of a piston ring and to register with said cutter checas having a slot i therein adapted to admit said cutter, a ton e slot, means for alternately rotating lsaid turret to bring said chucks successively intol alignnientwith said cutter and for producing a relative feeding movement between said cutter and turret, and means for manipulating said tongues controlled by the rotation'-l of said turret.

v 11. Apparatus for recutting gaps in pis.--

ton rings comprising the combination of a pair of elements comprising a cutter, and al chuck adapted .to coniine a ring to a predetei-mined circumferential dimension and?" having a slot therein adapted 'to admit said cutter, a ton e member carried b said chuck and positioned to intervene in t e gap between the ends of the r' and to register with said cutter slot where y the ring ends are positioned relative to said slot, means for producing a relative feeding movement between said chuck and cutter, and means automatically controlled by movement of the movable elements of the pair for retracting ysaid tongue in advance of said cutter.

l2. Apparatus for 'recutting gaps in piston rings comprising the combination of a pair of elements comprising a cutter, and a chuck adapted to conne aring to a predetermined circumferential dimension and having a slot therein adapted to admit said cutter, a tongue member carried by said chuck and positioned to intervene in the gap between the ends of the ring and to register with said cutter slot whereby the ring ends are positioned relative to said slot, meansy for c5 rings comprising, in' combination, a cutter, a producing u relative feeding :movement be- 'wil l tween seid chuck and cutter, and means auto- .matically controlled by movement of the movable elements of the-pair for retracting seid tongue relative to seid cutter slots in i advance of said cutter and for advancing said tongue after the operation of said cuty v- -JOSEPH H. HOEBN. 

